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Que. A hot fluid is being conveyed through a long pipe of 4 cm outer diameter and covered with 2 cm thick insulation. It is proposed to reduce the conduction heat loss to the surroundings to one-third of the present rate by further covering with same insulation. Calculate the additional thickness of insulation
a. 11 cm
b. 12 cm
c. 13 cm
d. 14 cm
Correct Answer:12 cm
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